1、1DC 666.123.35 : 620.1 : 543.21 DEUTSCHE NORM November 1986 DIN Analysis of raw materials used in glass production Chemical analysis of dolomite containing not less than 95 o/o of calcium magnesium carbonate I 52241 Diaestion method Part 2 Prfung von Rohstoffen zur Glasherstellung; chemische Analyse
2、 von Dolomit mit mindestens 95 % Calcium-Magnesium-Carbonat; Anschluverfahren In keeping with current practice in standards published by the International Organization for standardization (/so), a comma has been used throughout as the decimal marer. In this standard, % denotes percentage by mass whe
3、n contents are specified. 1 Field of application This standard specifies the method to be used for the digestion of dolomites containing not less than 95 % of calcium magnesium carbonate. 2 Principle A sample of dolomite obtained as described in DIN 52 241 Part 1 is boiled with hydrochloric acid, th
4、e residue is filtered off and the filtrate transferred to a volumetric flask. The residue is incinerated and ignited in a platinum crucible, and the silicon(1V)oxide evap- orated using a hydrofluoric acid/sulfuric acid mixture. The residue obtained is digested with a sodium carbonate/disodium tetrab
5、orate mixture, dissolved and combined with the filtrate obtained from the hydro- chloric acid digestion. 3 Apparatus See clause 3 of DIN 52 241 Part 1. In addition to the usual laboratory apparatus, the following shall be used: a) adjustable electric hot plate; b) electric oven capable of being adju
6、sted to c) platinum crucible provided with platinum lid, of (1100125)C; about 25ml nominal capacity. 4 Reagents See clause 4 of DIN 52 241 Part 1. In addition, the following reagents shall be used: a) anhydrous sodium carbonate, Na2C03; b) anhydrous disodium tetraborate, Na2B407. 5 Sampling and samp
7、le preparation As specified in clause 5 of DIN 52 241 Part 1. 6 Procedure Moisten 10,OOg (mo) of the sample obtained as described in clause 5 in a little water in a 400 ml beaker covered with a watch glass, carefully add 50 ml of hydrochloric acid (1 : 1) and boil for five minutes on the electric ho
8、t- plate. Filter off the residue obtained using a medium- hard filter, wash it with about 200 ml of hot water and collect the filtrate in a 500 ml volumetric flask. Place the filter paper and residue in the platinum cruci- ble, and after careful incineration, ignite for one hour in the oven at 1100C
9、. After cooling in a desiccator, weigh the platinum crucible (ml), mix the residue with a few drops of sulfuric acid (1 : 1) and about 20 ml of hydro- fluoric acid and carefully evaporate to dryness on the electric hot plate. To remove the fluorides completely, heat the platinum crucible to redness
10、(500 to 6OOOC) for a short time over a flame and then ignite for a further ten minutes at 1100C. Cool the platinum cru- cible and weigh it again (m2). The difference in mass, ml -m2, is equal to the mass of silicon(1V)oxide pre- cipitated. Digest the residue so obtained with 1 g of (7 : 1) sodium ca
11、rbonate/disodium tetraborate mixture over the flame with the platinum crucible covered and after cooling, dissolve the melt using 5 ml of hydro- chloric acid and water (1 : 1) while heating gently. Com- bine the solution with the filtrate obtained from the hydrochloric acid digestion in the 500 ml v
12、olumetric flask and make up to the mark with water. Use aliquot parts of this sample solution (VA) to determine other elements as specified in DIN 52 241 Parts 3 to 8. 1 ,O0 ml of this solution contains 20,O mg of dolomite. Continued on page 2 Beuth Verlag GmbH. Berlin. has the exclusive right of sa
13、le for German Standards (DIN-Normen). DIN 52 24 1 Part 2 Engi. Price group 10.89 Sales NO. 0105 Page 2 DIN 52 241 Part 2 Standards referred to DIN 52 241 Part 1 DIN 52 241 Part 3 DIN 52 241 Part 4 DIN 52 241 Part 5 DIN 52 241 Part 6 DIN 52 241 Part 7 DIN 52 241 Part 8 Analysis of raw materials used
14、in glass production; chemical analysis of dolomite containing not less than 95 % of calcium magnesium carbonate; general information and test report Analysis of raw materials used in glass production; chemical analysis of dolomite containing not less than 95 % of calcium magnesium Carbonate; determi
15、nation of silicon(1V)oxide Analysis of raw materials used in glass production; chemical analysis of dolomite containing not less than 95 % of calcium magnesium carbonate; determination of aluminium oxide Analysis of raw materials used in glass production; chemical analysis of dolomite containing not
16、 less than 95% of calcium magnesium carbonate; determination of total iron content calculated as iron(II1)oxide Analysis of raw materials used in glass production; chemical analysis of dolomite containing not less than 95 % of calcium magnesium carbonate; determination of titanium(1V)oxide Analysis
17、of raw materials used in glass production; chemical analysis of dolomite containing not less than 95 % of calcium magnesium carbonate; determination of manganese content calculated as MnO Analysis of raw materials used in glass production; chemical analysis of dolomite containing not less than 95 % of calcium magnesium carbonate; determination of calcium oxide and magnesium oxide International Patent Classification G O1 N 33/24 G O1 N 33/38 C 04 8 2/10 CO1 F 5/06 CO1 F 5/24 CO1 F 11/06 CO1 F 11/18
